With the first underwater passage running through, the Huating Reservoir on the opposite side of Shuijun Lake was finally connected, and the water of the lake on both sides slowly flowed with each other along the underground passage.

The national standard divides the water quality into 5 grades, Class I is the source water, and the national nature reserve, which is theoretically the best water quality, but it is very rare, and there is almost no in human gathering areas;

Class II. Suitable for centralized drinking water, surface water source first-class protection zone, rare aquatic organisms habitat, fish and shrimp spawning grounds, juvenile fish feeding grounds, etc.; Class III is the second-level protection area of surface water sources, fish and shrimp wintering, return passages, aquaculture areas and other fishery waters and swimming areas; Class IV refers to general industrial water use areas and recreational water areas that are not in direct contact with the human body; Category V. refers to agricultural water use areas and general landscape required waters.

Water below the fifth category basically has no use value, which is generally called wastewater.

The Huating Reservoir itself is a national AA scenic spot, and the water quality has reached the second category, which can be said to be the best water source for human gatherings, and it is precisely because of this that the fish raised in the Huating Reservoir are delicious and popular in the market;

The water quality of Shuijun Lake belongs to the fifth category, the last class, and the water quality of Shuijun Lake is very different, whether the fish can be fed or not is not necessarily, even if it is raised, the taste must be very poor, and it is barely enough to eat it yourself, not to mention selling money in the market.

It is precisely because of this that Zhu Chenggui, an old fisherman, told Su Ming that if he wanted to raise fish in a large area of Shuijun Lake, he must first improve the ecology of Shuijun Lake and improve the water quality in a few years.

Now, thanks to the underwater passage, which connects Shuijun Lake and Huating Reservoir together, and the water on both sides of the lake flows, theoretically speaking, it will not be long before the water quality of Shuijun Lake can approach the level of Huating Reservoir!

When it was almost dawn, the remaining passages were opened.

"Big head, you follow the passage and swim to the other side to have a look." Su Ming sent an order to the big-headed catfish.

Those who explore the road are generally cannon fodder, the passage collapses, and big fish appear in the reservoir opposite, and a small accident can lose a small life. The big-headed catfish is a greedy guy who is afraid of death, and after receiving the order, he did not hesitate to gather dozens of loaches and a group of crabs, and then carefully burrowed into a slightly larger underwater passage, followed by a team of loaches and crabs.

It's not stupid, in case of a blockage or landslide, crush it in the mud, and the 'rescue team' that follows can come in handy and start the rescue as soon as possible.

"I'll go, it turns out that you're not stupid, you're greedy for life and afraid of death, and you're smarter than anyone else!" Su Ming was stunned for a moment, and laughed.

The big head slowly swam forward along the channel, around, the lake water on both sides was slowly convection, and occasionally there would be some small fish and shrimp who didn't know which side mixed into the channel, and the big head passed by them, scaring them everywhere.

There is no danger along the way, most of the passage is reinforced with pipelines, basically there will be no more collapses, at most it is some mud and sand blocking the road, but there is a rescue team to follow behind, this is not a thing, the loaches can give the front of the obstacle to the arch loose, and then the crabs and lobsters go into battle to dredge the pipeline.

After half an hour, a small bright spot suddenly appeared in front of the dark passage, and it seemed that it was about to reach the end of the passage!

The big head and tail shook hard, like a small torpedo, and drilled out of the channel and entered the waters of Huating Reservoir!

As soon as he entered the reservoir, the big head immediately rushed to a burst of euphoria and relaxation, happily turning back and forth, but energetically spreading joy.

The water quality here is much better than that of Shuijun Lake, just like a person who lives in the capital all day long and breathes smog, and comes to a fairyland with green mountains and green waters.

The big head can be regarded as a 'veteran' under Su Ming, and Su Ming has 'cooperated' many times, and the spiritual connection between the two is much more stable than that of ordinary animals, if other animals are at such a distance, Su Ming can't contact each other at all.

Rao is like this, the distance of more than a kilometer also makes Su Ming feel powerless, and the spiritual power practice between the big head and the big head becomes extremely weak, so he hurriedly roared: "You can play in the future, first find out the environment for me!" ”

Su Ming is the boss of the big head, the parent of food and clothing, and the spiritual sustenance, his instructions are better than anything else, and even in a certain kind of Cheng dù, he can faintly suppress the big head's nature as a fish that loves water, after receiving the order, the big head immediately stopped shaking, the meat mustache on the side of his mouth shook slightly with the water waves, and he opened two big bulging fish eyes, carefully observing the surrounding environment.

The exit of the passage is under a hill, which is a mixture of stone and earth, which is relatively solid, and will not collapse without rare heavy rainstorms, and the location is relatively remote, there are no roads around, all of them are bushes, and some water birds make their homes in the bushes.

The exits of the five passages are all about three meters below the surface of the water, and the shallowest one is also more than two meters and a half.

This was planned by Su Ming before he made the hole, and the exit must be remote and secret enough to not be easily discovered. He didn't want to waste a lot of effort to break through the passage, only to be easily blocked by someone else from the other end.

From the current point of view, the location of these exits is so good that it is almost impossible to detect.

Not far away in the reeds, a long-billed waterfowl seemed to have found the storage of the big head, spread its wings, and the long legs of the waterfowl rose into the air, and swooped towards the big head against the water surface!

Like an arrow from a string, the waterfowl swooped down on the top of the big head like lightning, and the long, sharp beak pecked at the big head!

Wow......

The waterfowl's sharp beak plows a long wave of water on the surface of the water, and it flies almost flat against the surface of the water!

Fortunately, the big head has been with Su Ming for a long time, both the reaction and the physique are much stronger than the average catfish, at the last moment, the big head made a 'jack fall', the fat fish tail flicked desperately, and the big head fell into the deep water, which was able to escape!

Rao is like this, the big head is also frightened, and the back of the tail snorts, and a wave of turbidity emerges, and he is actually incontinent......

Don't look at the big-headed catfish is now more than a foot long, and its size is not inferior to that of water birds, but water birds are its natural enemies, even if it grows to ten catties and twenty catties, it will be scared to hide when it sees water birds, and in the eyes of water birds it is nothing more than a ball of larger meat.

Seeing that the food in the mouth slipped away, the waterfowl hovered on the surface of the water for a few weeks unwillingly, croaking twice at the surface of the water, and finally had nothing to do but fly away.

The big head in the lake was frightened, and it seemed to be running around like crazy, and even Su Ming's spiritual comfort couldn't calm it down immediately, after all, the two sides were too far apart.

After more than ten minutes, the big head was already dozens of meters away from the shore, and the feelings gradually calmed down.

It wagged its tail and was about to turn around and swim in the direction of the passage, but found that it could not use its strength, and there seemed to be something behind it, and it 'clung to' it!